Integration of led lighting with building controls

ABSTRACT

An LED-based light can be installed in a conventional light fixture. The LED-based light can include a sensor operable to output a signal indicative of whether an area of one or more of the rooms is in an occupied state or a non-occupied state, and the LED-based light can also include an LED controller operable to control at least one LED in the light in response to the signal. Additionally, the LED-based light can include a transmitter operable to output the signal indicative of whether the area is in the occupied state or the non-occupied state to a building environment regulator.

STATEMENT OF RELATED CASES

The present application is a continuation of U.S. patent applicationSer. No. 15/408,026, filed Jan. 17, 2017, now U.S. Pat. No. 10,342,086,which is a continuation of U.S. patent application Ser. No. 14/814,812,filed Jul. 31, 2015, now U.S. Pat. No. 9,585,216, which is acontinuation of U.S. patent application Ser. No. 14/064,757, filed Oct.28, 2013, now U.S. Pat. No. 9,101,026, which is a continuation of U.S.patent application Ser. No. 13/491,961, filed Jun. 8, 2012, now U.S.Pat. No. 8,571,716, which is a continuation of U.S. patent applicationSer. No. 12/572,601, filed Oct. 2, 2009, now U.S. Pat. No. 8,214,084,which in turn claims priority from U.S. Provisional Patent ApplicationSer. No. 61/108,358, filed Oct. 24, 2008, all of which are incorporatedby reference herein in their entireties.

FIELD

An LED-based light as described herein relates to “smart buildings” thatcan automatically control various environmental characteristics of oneor more rooms in a building.

BACKGROUND

Buildings typically include various systems for controlling conditionsinside the buildings, such as heating, ventilating, and air conditioning(HVAC) systems and lighting systems. HVAC systems and lighting systemsgenerally operate independent from one another. For example, athermostat can be set to control operation of an HVAC system, while alighting system can be turned on and off using a wall-mounted switch.

SUMMARY

Known smart buildings that can automatically control variousenvironmental characteristics of one or more rooms of a building aretypically expensive to manufacture and install. For example, known smartbuilding components typically are not compatible with standard buildingfixtures, such as conventional fluorescent tube fixtures, and thus canrequire an electrician to install.

Examples of LED-based lights described herein can be used to transform abuilding with standard fixtures, such as standard fluorescent tubefixtures, into a smart building. Many advantages are offered by theLED-based lights described herein, such as allowing for a low-cost smartbuilding.

Examples of systems for use in conjunction with a conventional lightfixture that are configured to receive a standardized electricalconnector of a conventional light are described herein. In one suchexample, the system includes a sensor operable to output a signalindicative of whether an area in a building is in an occupied state or anon-occupied state and an LED-based light. The LED-based light includesat least one electrical connector compatible with the conventional lightfixture, at least one LED, an LED controller operable to control the atleast one LED in response to the signal, and a transmitter operable totransmit the signal indicative of whether the area is in the occupiedstate or the non-occupied state to the regulator controller. The systemalso includes an environment regulator remote from the LED-based lightand is operable to control a temperature in the building in response tothe transmitted signal.

Examples of LED-based lights compatible with a standard light fixtureare also described herein. In one such example, the LED-based lightincludes a tube including a light transmitting portion, a pair ofelectrical connectors attached to opposing ends of the tube, the pair ofelectrical connectors compatible with the standard fluorescent lightfixture; at least one LED operable to produce light that passes throughthe light transmitting portion of the tube; a sensor operable to outputa signal indicative of whether one or more rooms in a building is in anoccupied state or a non-occupied state; an LED controller operable tocontrol the at least one LED in response to the signal, and atransmitter operable to output the signal indicative of whether the areais in the occupied state or the non-occupied state to an environmentregulator remote from the LED-based light and operable to control atemperature in the area in response to the transmitted signal.

Examples of methods for controlling an environmental condition in abuilding using an LED-based light including at least one electricalconnector compatible with a conventional light fixture and at least oneLED are also disclosed herein. In one such example, the method includesoutputting a signal indicative of whether an area in a building is in anoccupied state or a non-occupied state and controlling the at least oneLED in response to the signal. The method also includes transmitting thesignal indicative of whether the area is in the occupied state or thenon-occupied state to a location remote from the LED-based light andcontrolling at least a temperature in the area in response to thetransmitted signal.

These and other examples will be described in additional detailhereafter.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a smart building system;

FIG. 2 is a perspective view of an example of an LED light tube;

FIG. 3 is a perspective view of another example of an LED light tube;and

FIG. 4 is a perspective view of yet another example of an LED lighttube.

DESCRIPTION

FIGS. 1-4 show components of smart building systems. As shown in FIG. 1,a smart building system 10 for use in a building 11 can include an HVACsystem 12, a light fixture 14, an LED-based light 16, a controller 18,and one or more sensors 20. The HVAC system 12 can include known HVACcomponents, such as a heater, an air conditioner, fans, a thermostat,and ductwork. The HVAC system 12 can regulate the temperature, humidity,and/or other air quality considerations in one or more rooms of thebuilding 11. For example, the HVAC system 12 can maintain thetemperature in one or more rooms of the building 11 at a level near asetpoint temperature input to the thermostat. The HVAC system 12 canalso be capable of controlling airflow between the building 11 and theenvironment surrounding the building 11, such as by opening or closingvents, windows, skylights, and other barriers between the building 11and the surrounding environment. In addition or alternative to the HVACsystem 12, the smart building system 10 can include another type oftemperature control system (e.g., a control for heated floors), anothertype of light control system (e.g., a control for window shades ordynamically tinted windows), or some other control for the building 11.The HVAC system 12 can be in communication with the controller 18 as isdescribed below in greater detail.

The light fixture 14 can be designed to accept standard fluorescenttubes, such as a T-5, T-8, or T-12 fluorescent tube, or other standardsized light, such as incandescent bulbs. Alternatively, the fixture 14can be designed to accept non-standard sized lights, such as lightsinstalled by an electrician. Additionally, the fixture 14 can includeone or more fixtures. The fixture 14 can be in communication with thecontroller 18 for controlling the operation of the light 16 as isdescribed below in greater detail.

The LED light tube 16 can include a housing 22, a circuit board 24, LEDs26, and a pair of end caps 28 as shown in FIG. 2. The housing 22 asshown in FIG. 2 is light transmitting and has the shape of a cylindricaltube. The housing 22 can be made from polycarbonate, acrylic, glass oranother light transmitting material (i.e., the housing 22 can betransparent or translucent). For example, a translucent housing 22 canbe made from a composite, such as polycarbonate with particles of alight refracting material interspersed in the polycarbonate. While theillustrated housing 22 is cylindrical, housings having a square,triangular, polygonal, or other cross sectional shape can alternativelybe used. Similarly, while the illustrated housing 22 is linear, housingshaving an alternative shape, e.g., a U-shape or a circular shape canalternatively be used. Additionally, the housing 22 need not be a singlepiece as shown in FIG. 2. Instead, another example of a housing can beformed by attaching multiple individual parts, not all of which need belight transmitting. For example, such a housing can include an opaquelower portion and a lens or other transparent cover attached to thelower portion to cover the LEDs 26. The housing 22 can be manufacturedto include light diffusing or refracting properties, such as by surfaceroughening or applying a diffusing film to the housing 22. Forcompatibility with the fixture 14 as discussed above, the housing 22 canhave a length such that the light 16 is approximately 48″ long, and thehousing 22 can have a 0.625″, 1.0″, or 1.5″ diameter.

The circuit board 24 as illustrated in FIG. 2 is an elongate printedcircuit board. Multiple circuit board sections can be joined by bridgeconnectors to create the circuit board 24. The circuit board 24 as shownin FIG. 2 is slidably engaged with the housing 22, though the circuitboard 24 can alternatively be clipped, adhered, snap- or friction-fit,screwed or otherwise connected to the housing 22. For example, thecircuit board 24 can be mounted on a heat sink that is attached to thehousing 22. Also, other types of circuit boards may be used, such as ametal core circuit board. Or, instead of a circuit board 24, other typesof electrical connections (e.g., wires) can be used to electricallyconnect the LEDs 26 to a power source.

The light 16 can include two bi-pin end caps 28 (i.e., each end cap 28can carry two pins), one at each longitudinal end of the housing 22, forphysically and electrically connecting the light 16 to the fixture 14.The end caps 28 can be the sole physical connection between the light 16and the fixture 14. The end caps 28 can be electrically connected to thecircuit board 24 to provide power to the LEDs 26. Each end cap 28 caninclude two pins, though two of the total four pins can be “dummy pins”that do not provide an electrical connection. Alternatively, other typesof electrical connectors can be used, such as an end cap carrying asingle pin. Also, while the end caps 28 are shown as includingcup-shaped bodies, the end caps 28 can have a different configuration(e.g., the end caps 28 can be shaped to be press fit into the housing22). One or both of the end caps 28 can additionally include electriccomponents, such as a rectifier and filter.

The LEDs 26 can be surface-mount devices of a type available fromNichia, though other types of LEDs can alternatively be used. Forexample, although surface-mounted LEDs 26 are shown, one or more organicLEDs can be used in place of or in addition thereto. The LEDs 26 can bemounted to the circuit board 24 by solder, a snap-fit connection, orother means. The LEDs 26 can produce white light. However, LEDs thatproduce blue light, ultra-violet light or other wavelengths of light canbe used in place of white light emitting LEDs 26.

The number of LEDs 26 can be a function of the desired power of thelight 16 and the power of the LEDs 26. For a 48″ light, such as thelight 16, the number of LEDs 26 can vary from about five to four hundredsuch that the light 16 outputs approximately 500 to 3,000 lumens.However, a different number of LEDs 26 can alternatively be used, andthe light 16 can output a different amount of lumens. The LEDs 26 can beevenly spaced along the circuit board 24, and the spacing of the LEDs 26can be determined based on, for example, the light distribution of eachLED 26 and the number of LEDs 26.

While the light 16 is shown as being compatible with standard sizedfluorescent fixtures, an LED-based light having another shape, such asan incandescent bulb or another type of light, can alternatively beused. Also, other types of light sources, such as fluorescent orincandescent based light sources, can be used instead of the LEDs 26.

Referring again to FIG. 1, the controller 18 can include a memory and aCPU for executing a program stored on the memory. The controller 18 canbe in communication with the sensor 20 for receiving a detection signalα from the sensor 20 as is described below in greater detail.Additionally, the controller 18 can be in communication with the HVACsystem 12 and fixture 14 for controlling operation of the HVAC system 12and the output of the light 16. For example, the controller 18 can be incommunication with the various components of the HVAC system 12 forcontrolling their respective operation, and the controller 18 canfurther control the amount of power supplied by the fixture 14 to thelight 16. Also, the controller 18 can include multiple controllers, suchas a controller for a heating portion of the HVAC system 12, anothercontroller for a ventilation portion of the HVAC system, and yet anothercontroller coupled to the fixture 14 for controlling the amount of powersupplied to the light 16.

The sensor 20 can include a motion sensor, a sensor for determiningwhether a door is ajar, a sensor for determining when a keypad or othertype of lock is actuated, a voice-activated sensor, a clock or calendar,an ambient light sensor, a power supply monitor, and/or another type ofsensor. The sensor 20 can include multiple types of sensors fordetecting different types of activities (e.g., the sensor 20 can includea clock and a motion sensor). Additionally, the sensor 20 can includemultiple sensors in different rooms or spaces of the building 11.

In operation, the sensor 20 can perform detection and, in response, sendthe detection signal α to the controller 18. The detection signal α canindicate whether the building 11 is in an occupied state or anunoccupied state. For example, if the sensor 20 includes a motiondetector, the sensor 20 can send the detection signal α to thecontroller 18 to indicate the building is in the occupied state whenmotion is detected. The sensor 20 can continuously send the detectionsignal α to the controller 18, or the sensor 20 can send the detectionsignal α only when a positive detection (e.g., an indication that thebuilding is in the occupied state) occurs. The detection signal α canalso indicate that the building is in the unoccupied state when, forexample, a predetermined amount of time has passed since a positivedetection last occurred, or when the sensor 20 includes a clock and thetime is past normal working hours. Also, the detection signal α caninclude signals from multiple types of sensors making up the sensor 20,such as a voice-activated sensor, a motion sensor, and a clock. If thecontroller 18 receives signals from multiple sensors 20 in differentlocations, the detection signal α can include a location of thedetection (e.g., a specific room or area of the building 11).

Also in operation, the controller 18 can control the function of theHVAC system 12 and the light 16 in response to the detection signal α,such as when the detection signal α indicates the building state haschanged from the occupied state to the unoccupied state and vice versa.For example, the controller 18 can output a control signal β to turn onthe HVAC system 12 and the light 16 in response to a detection signal αindicating the building is in the occupied state, and the controller 18can output the control signal β to turn off the HVAC system 12 and thelight 16 in response to an indication that the building is in theunoccupied state.

Additionally, the control signal β output by the controller 18 can domore than control the HVAC system 12 and light 16 between on and offstates depending solely on whether the building 11 is occupied orunoccupied. That is, the controller 18 can analyze the detection signalα to determine the control signal β. The control signal β can be basedon the efficiency of the smart building system 10. For example, thecontrol signal β can control a temperature setting of the HVAC system 12(e.g., either by altering or overriding the setpoint temperature on thethermostat of the HVAC system 12) in order to allow the temperature inan area of the building 11 to increase during a warm night or decreaseduring a cool night 11. As a result, the HVAC system 12 can use lesspower during periods of time when the temperature of the building 11 canvary without making occupants uncomfortable. As another example, thecontrol signal β can control the HVAC system 12 to open one or morebarriers between the building 11 and the external environment when thetemperature of the external environment is closer to the setpointtemperature than the temperature in the building 11, thereby reducingthe power consumption of the HVAC system 12. As yet another example, thecontrol signal β can reduce the amount of power provided to the fixture14 to dim the lights 16, such as when the detection signal α indicatesthat an amount of ambient light is high or when the detection signal αindicates that the time is after working hours in order to reduce thepower consumption of the lights 16. Similarly, the control signal β canturn on the lights 16 when an occupant is detected, making the lights 16more convenient to operate.

Further, if the detection signal α includes signals from multiple typesof sensors making up the sensor 20, the controller 18 analyzes thedetection signal α to determine the control signal β. For example, ifthe sensor 20 includes a clock and a motion sensor, the controller 18can be configured to output the control signal β based on the detectionsignal α output by the clock portion of the sensor 20 on weekdays (e.g.,to reduce the power supplied to the HVAC system 12 and/or the lights 16after working hours) and based on the detection signal α output by themotion sensor portion of the sensor 20 on weekends (e.g., to providepower to the HVAC system 12 and/or the lights 16 when the building is inthe occupied state). As another example, if the sensor 20 includes avoice-activated sensor and a keypad, the controller 18 can be configuredto output the control signal β based on the signal output by thevoice-activated portion of the sensor 20 and not based on the keypadportion of the sensor 20 when warranted by the signal detected by thevoice-activated portion of the sensor 20 (e.g., the controller 18 cansend the control signal β to eliminate power to the light 16 in an areaof the building 11 in response to a detection signal α corresponding toa command similar to “Turn off the lights” detected by thevoice-activated portion of the sensor 20 even though the keypad portionof the sensor 20 indicates one or more people are present in the area ofthe building 11).

The controller 18 can also analyze the detection signal α to determinelikely future areas people will occupy and output the control signal βaccordingly. For example, if the controller 18 receives a detectionsignal α indicating that a keypad portion of the sensor 20 detectsactuation of a keypad outside a door at one end of a hallway, thecontroller 18 can control the HVAC system 12 and/or the lights 16 in thehallway and in rooms adjacent to the hallway in anticipation of thoserooms being occupied. As another example, if the controller 18 receivesa detection signal α indicating that a motion sensor portion of a sensor20 detects the presence of motion outside a main entry to the building11, the controller 18 can control lights 16 in a lobby.

As another example of operation of the smart building system 10, if thesensor 20 includes a power supply monitor, the detection signal α canindicate an amount of power used by the building 11 or certain systemsof the building (e.g., an amount of power used in the aggregate by theHVAC system 12 and the light 16). Alternatively, instead of receivingthe detection signal α expressly indicating an amount of power used bythe building 11, the controller 18 can estimate the building power usagebased on, e.g., the time of day if the sensor 20 includes a clock, thetime of year if the sensor 20 includes a calendar, the number of areasof the building 11 occupied, and/or other considerations. That is, theestimate can be based on assumptions such as the building 11 using lesspower at night, the building 11 using more power during cold weather,the building 11 using more power when heavily occupied, and otherassumptions.

The controller 18 can analyze the power consumption of the building 11to determine the control signal β. For example, when the powerconsumption is high (e.g., above a predetermined amount), the controller18 can reduce an amount of power provided to the light 16, therebydimming the light 16. As another example, the controller 18 candetermine or estimate which spaces of the building 11 are occupied, andonly provide light to those areas (or not reduce light to those areas)during times of high power consumption. The controller 18 can allowoccupants to override the control signal β if the amount of lightprovided by the light 16 is not deemed appropriate by occupants.Similarly, the controller 18 can control the HVAC system 12 based on thepower consumption of the building 11, such as by allowing thetemperature in unoccupied areas of the building 11 to increase ordecrease.

Thus, as explained in various examples above, the control signal β canbe solely based on, partially based on, or not based on whether thebuilding 11 is in the occupied state or unoccupied state. Among otheradvantages, the smart building system 10 can allow for energy efficientoperation of the HVAC system 12 and the light 16 as explained in variousexamples above. Additionally, the controller 18 can control operation ofthe HVAC system 12 and light 16 without effort by occupants of thebuilding 11, such as by eliminating the need for occupants to turn thelight 16 on or off upon entering and exiting the an area of the building11. The controller 18 can also control the HVAC system 12 and/or light16 based on the power drawn by the building 11 to, for example, reducethe power consumption of the HVAC system 12 and/or light 16 during timesof high power consumption.

While the light 16 in the smart building system 10 of FIG. 1 iscontrolled by a controller 18 separate from the light 16, anotherexample of a light 30 as shown in FIG. 3 can include a controller 32mounted on the circuit board 24. That is, in addition to the housing 22,circuit board 24, LEDs 26, and end caps 28, the light 30 can include thecontroller 32. The controller 32 can include a CPU and a memory storinga program to be executed by the CPU, and the controller 32 can be incommunication with the LEDs 26 via the circuit board 24 or by othermeans (e.g., wires separate from the circuit board 24). Also, while thelight 30 is shown and described as being shaped for compatibility with afluorescent tube accepting fixture, the light 30 can have an alternativeshape, such as an incandescent bulb or another type of light, and canuse alternative sources of light, such as an incandescent, fluorescent,or halogen light.

In order to receive the detection signal α, the light 30 canadditionally include a receiver 34 mounted on the circuit board 24. Thesensors 20 can be in communication with a transmitter (not shown) fortransmitting the detection signal α to the receiver 34. For example, thereceiver 34 can be in communication with the transmitter using astandard wireless protocol (e.g., a radio standard, a cellular standardsuch as 3G, Bluetooth, or WiFi). The receiver 34 can alternatively be incommunication with the transmitter in another manner such as hardwiringor via electric signals sent through the end caps 28. The receiver 34can also be in communication with the controller 32 (e.g., thecontroller 32 and receiver 34 can communicate via the circuit board 24,or the controller 32 and receiver 34 can be an integral unit), allowingthe receiver 34 to communicate the detection signal α to the controller32. The controller 32 can control the LEDs 26 in response to thedetection signal α detected by the sensors 20 similar to the controller18 controlling the light 16 described above in reference to FIG. 1.

In addition to the advantages described above with reference to thesmart building system 10, integrating the receiver 34 with the light 30of FIG. 3 can allow for easy installation of the light 30. For example,many buildings include standard fluorescent fixtures for accepting thelight 30. Since the receiver 34 can be wireless, the light 30 can beinstalled in a standard fluorescent fixture as easily as a normalfluorescent tube.

While the lights 16 and 30 are described as separate from sensors 20, alight 40 as shown in FIG. 4 can include the housing 22, the circuitboard 24, LEDs 26, end caps 28, the controller 32, the receiver 34, anda sensor 36 mounted on the circuit board 24. Like the sensor 20, thesensor 36 can include a motion sensor, a voice-activated sensor, a clockor calendar, an ambient light sensor, and/or another type of sensor. Thesensor 36 can include multiple types of sensors for detecting differenttypes of activities (e.g., the sensor 36 can include a clock and amotion sensor). The sensor 36 can be in communication the controller 32via the circuit board 24 or by other means, such as being hard wired tothe controller 32 or formed integrally with the controller 32. The light40 can additionally include a transmitter 38 for communicating by way ofa standard wireless protocol or other means (e.g., hardwiring) to aremote location, such as a smart building control center. Thetransmitter 38 can be in communication with the sensor 36 via thecircuit board or by other means, such as being hard wired to the sensor36 or formed integrally with the sensor 36.

In operation, the sensor 36 can perform detection and, in response, sendthe detection signal α to the controller 32. The controller 32 canperform at least one of a variety of functions in response to thedetection signal α. The controller 32 can control the LEDs 26 based onwhether the area of the building 11 in which the light 40 is located isoccupied or unoccupied. For example, a motion sensor portion of thesensor 36 can indicate whether the area of the building 11 in which thelight 40 is located is occupied, and the controller 32 can turn the LEDs26 on or off (or otherwise control the LEDs 26) based on the detectionsignal α.

Further, including the transmitter 38 allows the light 40 to communicatethe detection signal α to a remote location, such as a smart buildingcontrol center that can control operation of other building systems(e.g., an HVAC system). Thus, the detection signal α picked up by thesensor 36 can be used as an input to control portions of a smartbuilding other than the light 40. As an example, if the sensor 36includes a motion detector, a smart building control center can alterthe control of an HVAC system when the sensor 36 indicates apredetermined amount of time has passed since motion was last detected.

The light 40 can also include the receiver 34. Including the receiver 34allows the controller 32 of the light 40 to control the LEDs 26 based onsignals picked up from sensors 20 outside the light 40, such as a powersupply sensor or a remote ambient light sensor (though an ambient lightsensor integral with the light 40 can alternatively or additionally beused). The controller 32 can control the LEDs 26 in the light 40 basedon, for example, a low power availability indication transmitted to thereceiver 34. Thus, the controller 32 can reduce the power consumption ofthe LEDs 26 during times that the building 11 is using a large amount ofpower, when a generator is providing power, or at other times duringwhich power should be conserved.

The above-described embodiments have been described in order to alloweasy understanding of the invention and do not limit the invention. Onthe contrary, the invention is intended to cover various modificationsand equivalent arrangements included within the scope of the appendedclaims, which scope is to be accorded the broadest interpretation so asto encompass all such modifications and equivalent structure as ispermitted under the law.

1.-19. (canceled)
 20. A system comprising: a sensor configured, duringoperation, to output a first signal indicative of an occupational stateof an area in a building; an LED-based light configured, duringoperation, to provide artificial light to the area, the LED-based lightincluding: at least one standardized electrical connector, wherein theleast one standardized electrical connector is compatible with aconventional light fixture, at least one LED, an LED controllerconfigured, during operation, to control the at least one LED inresponse to the first signal, a transmitter configured, duringoperation, to transmit, based on the first signal, a second signal to anenvironmental regulator configured to control a quality of air in thearea in response to the second signal, and a housing enclosing the atleast one LED, the LED controller, and the transmitter, wherein thehousing is connected to the at least one standardized electricalconnector.
 21. The system of claim 20, wherein the sensor is remote fromthe LED-based light.
 22. The system of claim 20, wherein the housingencloses the sensor.
 23. The system of claim 20, wherein theenvironmental regulator is remote from the LED-based light.
 34. Thesystem of claim 20, wherein the first signal indicates a location of thearea in the building.
 25. The system of claim 20, further comprising oneor more additional sensors, wherein each additional sensor isconfigured, during operation, to output a respective additional signalindicative of a respective occupational state of a respective additionalarea in the building.
 26. The system of claim 25, wherein thetransmitter is configured, during operation, to transmit the secondsignal based further on the one or more additional signals.
 27. Thesystem of claim 20, wherein controlling the quality of air in the areacomprises controlling a flow of air between the building and anenvironment surrounding the building.
 28. The system of claim 28,wherein controlling the flow of air between the building and theenvironment surrounding the building comprises controlling the flow ofair using an HVAC system.
 29. The system of claim 28 wherein the HVACsystem comprises at least one of a heater, an air conditioner, a fan, athermostat, or ductwork.
 30. The system of claim 27 wherein controllingthe flow of air between the building and the environment surrounding thebuilding comprises controlling one or more barriers between the buildingand the environment surrounding the building.
 31. The system of claim30, wherein the one or more barriers comprise at least one of a vent, awindow, or a skylight.
 32. The system of claim 20, wherein controllingthe quality of air in the area comprises regulating a temperature and/ora humidity of the area.
 33. The system of claim 20, wherein controllingthe quality of air in the area comprises controlling the quality of airin two or more rooms in the building.
 34. The system of claim 20,wherein the LED-based light is a replacement bulb comprising a connectorfor installing the replacement bulb in a conventional light fixture. 35.The system of claim 34, wherein the replacement bulb is a replacementfor a standard fluorescent tube.